package com.itheima.core.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.itheima.core.po.User;

/**
 * 登录拦截器
 * @author Yancy
 *
 */
public class LoginInterceptor implements HandlerInterceptor{

	@Override
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		//获取请求的URL
		String url = request.getRequestURI();
		//URL:除了登录请求以外,其他的URL都进行拦截控制
		if(url.indexOf("/login.action")>=0) {
			return true;
		}
		//获取Session
		HttpSession session = request.getSession();
		User user = (User) session.getAttribute("USER_SESSION");
		//判断Session中是否有用户数据,如果有,则返回true,继续向下执行
		if(user!=null) {
			return true;
		}
		//不符合条件的给出提升信息,并转发到登录页面
		request.setAttribute("msg","您还没有登录,请先登录!");
		request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
		return false;
	}
	

}
